At the end of the description for the approach, you said " take a left trending 3rd class groove up the summit spire. " Whereas this will take you to the top, as I examined it. There is an much easier route with much less exposure.
I think this could be more descriptive:
As the trail ends at the summit block, you will notice a 3rd class grove (large enough to climb throgh) trending to the left; this approach will take you to the top, but has exposure. The easiest way up is to stand in front of the summit block and looke to the right. You will also see a narrow groove (few inches) to the right, currently marked at the base with a large cairn. Take this route up. After the initial 15 feet, it gets much easier to the summit.
Olympic Range (WA)